Light-weight large-aperture rough boring cutter

The utility model discloses a light-weight large-aperture rough boring cutter. The device comprises a fixing assembly, a transverse adjusting assembly, a longitudinal adjusting assembly and a cuttingassembly. The transverse adjusting assembly is detachably installed on the fixing assembly. The longitudinal adjusting assembly is arranged on the transverse adjusting assembly in a sliding mode. Thefixing assembly comprises a fixing base and a fixing block. The transverse adjusting assembly comprises a coarse adjusting device and a fine adjusting device. The longitudinal adjusting assembly comprises a tool bit base and an adjusting block. The tool bit seat is longitudinally arranged at the top of the fine adjustment device in a sliding manner; the cutting assembly comprises a rhombic tool bit; according to the boring cutter, various forms of adjustment such as transverse adjustment, longitudinal adjustment, rough adjustment and fine adjustment can be achieved through all the adjustment assemblies, machining is fa